Product : Fedora Core 3
Name : exim
Version : 4.43
Release : 1.FC3.1
Summary : The exim mail transfer agent
Description :
Exim is a mail transport agent (MTA) developed at the University of
Cambridge for use on Unix systems connected to the Internet. In style
it is similar to Smail 3, but its facilities are more extensive, and
in particular it has options for verifying incoming sender and
recipient addresses, for refusing mail from specified hosts, networks,
or senders, and for controlling mail relaying. Exim is in production
use at quite a few sites, some of which move hundreds of thousands of
messages per day.

This erratum fixes two relatively minor security issues which were discovered
in Exim in the last few weeks. The Common Vulnerabilities and Exposures
project (cve.mitre.org) has assigned the names CAN-2005-0021 and CAN-2005-0022
to these, respectively.

1. The function host_aton() can overflow a buffer if it is presented with an
illegal IPv6 address that has more than 8 components.

2. The second report described a buffer overflow in the function
spa_base64_to_bits(), which is part of the code for SPA authentication. This
code originated in the Samba project. The overflow can be exploited only if
you are using SPA authentication.

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